Data Sheet - Coto Technology

Top View
REDROCK MEMS-BASED REED SENSOR
™
0.84(0.033)
RedRock™ MEMS-Based Reed Sensor
Ideally suited to the needs of Medical, Industrial, Instrumentation, Automotive, and
other applications where small size, zero power1.32(0.052)
operation, and directional magnetic
sensitivity are required, the RedRock ™ MEMS-Based Reed Sensor is a single-pole,
single throw (SPST) device with normally open ruthenium contacts. The sensor may
be actuated by an electromagnet, a permanent
magnet,
Side
Viewor a combination of both.
™
RedRock™ MEMS-Based Reed Sensor
1.05(0.041)
u 1.11mm 2 Footprint – World’s Smallest Reed Sensor
u Highly Directional Magnetic Sensitivity
APPLICATIONS
u Hot Switchable
u Medical Devices
u 750 G Shock Resistance
u Battery Powered Devices
u Wide Operating Temperature Range
u Prosthetics
u Hermetically Sealed
BottomuView
u Ideal for SMD Pick and Place
Robotics
0.300 0.435
u Animal Tracking
u Tape and Reel Packaging
(0.012)
(0.017)
u High Resolution Position &
u RoHS Compliant
Level Sensing
0.686(0.027)
0.457(0.018)
DIMENSIONS
in Millimeters (Inches)
Top View
0.735(0.029)
Recommended PCB Land pattern as
viewed from bottom of die (pad side)
1.285(0.051)
0.84(0.033)
0.55(0.022)
1.32(0.052)
0.80(0.031)
0.185(0.007)
Side View
0.744(0.029)
1.05(0.041)
Ordering Information
Part Number RR100-X W TR
Product Packaging
Model Number
TR=Tape/Reel
RR100
Bottom View
Typical Magnetic Sensitivity
J=20mT
K=12mT
0.300 0.435
(0.012) (0.017)
Package Style
W=Wafer Level
Operating Temperature Range is -40ºC to +85ºC
0.686(0.027)
0.457(0.018)
Ordering Information (Evaluation Kit)
Part Number: RR100-EK1
0.735(0.029)
All specifications are typical unless otherwise specified and subject to change without notice.
For more information please refer to Coto Technology’s Product Warranty, Trademarks & Disclaimers.
rev. 03202015
1.285(0.051)
2
0.55(0.022)
COTO TECHNOLOGY | tel: (401) 943.2686 | cotorelay.com
0.80(0.031)
REDROCK™ MEMS-BASED REED SENSOR
REDROCK™
RR100
Parameters
OPERATING CHARACTERISTICS
Units
Min
Typ
Max
Operate Sensitivity1 - K
J
mT
Operate Time (including bounce)
μs
500
Release Time
μs
500
Switched Voltage
VDC
6
Switched Current
mA DC
1
12
20
ELECTRICAL CHARACTERISTICS
Breakdown Voltage
VDC
50
Contact Resistance (Initial)
W
10
Contact Capacitance
pF
0.2
Insulation Resistance (Min.)
W
1012
Operations
107
ºC
-55 to +150
ºC
-40 to +85
LIFE EXPECTANCY
1.2VDC, 1mA switching load2
ENVIRONMENTAL RATINGS
Storage Temperature
Operating Temperature
Vibration Resistance - Functional
3
Shock Resistance - Functional
Shear Force5
4
G
100
G
750
gm
400
Notes:
Individual switches may vary in magnetic closure sensitivity by ± 4 mT (Model K) or ± 7 mT (Model J) from the typical value.
If your application requires a different sensitivity range, please contact Coto at [email protected]
2
Life expectancy defined as mean cycles before failure with end of life defined as contact resistance >1000 W.
3
Functional Vibration Resistance is defined as the mechanical-only force (in G, 110 Hz - 3 kHz), that a switch can withstand without causing a
contact closure.
4
Functional Shock Resistance is defined as the mechanical-only force (in G), that a switch can withstand without causing a contact closure.
5
Shear Force is the mechanical force (applied to the top half, in a plane parallel to the PCB) that a switch can withstand without causing damage
to the switch.
1
For all inquiries,
please contact [email protected]
COTO TECHNOLOGY | tel: (401) 943.2686 | cotorelay.com
rev. 03202015
3
REDROCK™ TECHNICAL & APPLICATIONS INFORMATION
SWITCH ANGLE SENSITIVITY
ATTACHMENT DETAILS
The RR100 switch may be attached to the user’s circuit board using either SnPb eutectic alloy or SAC alloy solder pastes. Recommended reflow profiles for both types of solder are shown below.
RR100
90
14
120
60
250
12
10
8
30
Temperature (C)
150
6
4
2
180
14
12
10
8
6
4
2
2
Peak Temperature
226∞C Max
200
150
Reflow zone
Time above
183∞C
(60 - 90 sec)
100
Pre-flow zone
50
2
4
6
8
10
12
14
0
0
0
Cooling
zone
Pre-heating
zone
Ambient
30
60
90
120
4
10
270
300
Peak Temperature
250
Temperature (C)
300
270
Adv on (mm) vs angle polar
Retract off (mm) vs angle polar
235-260∞C
(20 sec max)
200
Reflow zone
Time above
217∞C
(60 - 90 sec)
150
100
<2.5∞C/sec
50
Ambient
Fig. 1: Black points indicate relative magnetic closure sensitivity
of the RR100 switch. Switch viewed from top. Note position of
switch orientation dot.
SWITCH FUNCTIONAL DIAGRAM
NO MAGNETIC FIELD
240
300
12
14
210
330
8
240
180
Fig. 3: Recommended reflow profile – SnPb alloy
6
210
150
Time (sec)
0
0
Pre-flow zone
Cooling zone
Pre-heating
zone
30
60
90
120
150
180
210
240
270
300
Time (sec)
Fig. 4: Recommended reflow profile – SAC alloy.
SWITCH PACKAGING
Standard Packaging for the RR100 switch is Tape and Reel.
Dimensions are shown below.
MAGNETIC FIELD PRESENT
2.00±0.05
(0.079±0.001)
P2
1
SWITCH
PADS
[
Ø 1.50 +.10
-.00
Do
4.00 (0.157)
Po
2
+.0039
.0591
-.0000
POCKET SIZE
Ao - 1.08mm (.043”)
Bo - 1.57mm (.062”)
Ko - 1.12mm (.044”)
]
1.75 (0.069)
E1
8.0 (0.315)
NOMINAL
6.25
(0.246) 8.30 (0.327)
MAX
E2
W
3.50±0.05 MIN
(0.138±0.001)
F
Fig. 2: Switch is magnetically operated, normally-open, singlepole, single-throw (SPST). Closes when immersed in a magnetic
field that exceeds 20 mT (Type J) or 12 mT (Type K) Operation
is independent of the magnetic polarity.
3º
1.57 (.062)
Bo
4.00 (.157)
P
.30 (.012)
T
1.12 (.044)
Ko REV.1
3º
1.08 (.043)
Ao REV.1
EXPECTED LIFE
Ten million cycles, 1.2 V 1.2 mA hot switched load, when operated by a magnetic field having twice the nominal closure field.
End of life defined as contact resistance exceeding 1000 Ω.
Fig. 5: Tape and reel Packaging
rev. 02122015
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COTO TECHNOLOGY | tel: (401) 943.2686 | cotorelay.com
REDROCK™ TECHNICAL & APPLICATIONS INFORMATION
SAMPLE APPLICATIONS CIRCUITS
Vcc
1. Conversion to Single Pole Single Throw Normally
Closed Operation
In some cases, it is desirable for the switch to open in the presence of a magnetic field rather than to close. This functionality
can be achieved with the circuit shown below, which incorporates
a P-channel enhancement-mode MOSFET. R2 can be selected
in the range of 100 Megohms to several thousand Megohms
depending on the characteristics of the MOSFET. When the
RedRock switch is open, the gate is negative biased relative to the
source, allowing battery current to flow to the load. Conversely,
when the switch is closed, the MOSFET turns off. Note that
a small quiescent current drained from the battery through R2
while the switch is closed. Bear this in mind when selecting the
battery type and value of R2.
Bat
RR100
switch
R1
1 Meg
R1
10K
RR100
switch
microcontroller
R2
wake-up pin
see note
Fig. 7: Typical method of interfacing an RR100 switch to a lowpower microcontroller. When RR100 switch opens, wake-up pin
goes logic low, bringing microcontroller out of sleep mode. R2
should be no greater than one-tenth of the microcontroller’s input
pin impedance.
PMOS
M1
R2
LOAD
Fig. 6: Conversion to normally closed (N/C) functionality, using
P-channel, enhancement mode MOSFET.
2. Interfacing RedRock with Microcontrollers
Most low power microcontrollers, have one or more pins designated as interrupt or “wake-up” pins. Suitably programmed,
the microcontroller recognizes a positive or negative logic level
transition on the designated pin and changes from a sleep mode
where very little power is consumed to full operational mode.
The RR100 switch shown in Figure 7 is normally closed by a
magnet; when it opens, the wake-up pin goes low, waking up
the microcontroller. R2 should be chosen to be as large a value
as possible, but no higher than one-tenth the input impedance
of the wake-up pin. This will minimize the quiescent current
draw through R1 and R2 while the switch is closed. Consult the
microcontroller documentation for further details.
GENERAL APPLICATIONS NOTES
AND INFORMATION
1. Choosing magnets
The RR100 switch can be operated by any permanent magnet
that generates a magnetic field at the required operating distance
that is greater than the lower end of the switch’s nominal closure
sensitivity range. For example, a RR100-JWTR switch will close
when immersed in a field that exceeds 20 mT, when it is angled
towards the pole of the magnet at the angle shown in Figure 1.
This is the minimum required field; for optimum contact life, a
higher field is desirable, and there is no maximum field that will
damage the switch. Bear this in mind when designing a switchmagnet system.
2. mT vs A/m, Gauss and Oe
Coto specifies switch closure sensitivity in mT (millitesla). One
mT is equivalent to exactly 10 Gauss or approximately 1.257 A/m
(Amps per meter). One Oe (Oersted) = 1 Gauss in air.
3. Magnetic overdrive
Magnetic overdrive is any excess magnetic field above the minimum level needed to just close the switch. For example, if the
nominal closure field is 20 mT and the switch is immersed in a
field of 40 mT, 100% overdrive is being applied. Overdrive is
desirable, since higher forces are applied to the contacts, and the
contact resistance is reduced. There is no level of overdrive
rev. 02122015
COTO TECHNOLOGY | tel: (401) 943.2686 | cotorelay.com
5
REDROCK™™ TECHNICAL & APPLICATIONS INFORMATION
GENERAL APPLICATIONS NOTES
AND INFORMATION, CONT.
Operate Value (mT): The mT value at which normally-open
contacts close. Lower values reflect higher sensitivity.
that can damage the switch. Therefore, use the strongest, largest
magnet that is practical for the application.
4. High fields cannot damage switch
Strong magnetic fields will not damage the switch or change its
closure sensitivity.
5. Polarity insensitive
The switch responds equally to N (positive) or S (negative) fields.
6. Optimum orientation of magnet relative to switch
The switch has maximum closure sensitivity when the magnet is
oriented at 60o relative to its long axis. Refer to the diagram in
Fig. 1, and note that the position of the location dot is important.
7. Magnetic environment near the switch
is important
Ferrous materials such as metal frames and component enclosures etc. located near the magnet and switch can alter the switch
closure sensitivity, by attenuating or enhancing the field reaching the switch. Coto recommends that the switch and magnet
be tested in the applications environment, including all ferrous
structures.
8. Shunts and field concentrators
Ferrous structures located near the magnet and switch can
sometimes be used advantageously to increase the magnetic
field strength near the switch and increase its apparent magnetic
sensitivity. These arrangements can be investigated experimentally, but simulation using magnetic modeling programs is more
efficient.
Operate Time: The operate time is the time between the
instant of application of a magnetic field to a dry-reed switch and
the instant of the first physical closing of this switch. The operate
time does not include bounce time.
Release Value (mT): The mT value at which normally-open
contacts, held closed by a magnetic field, will re-open as field
strength is reduced.
Release Time: The release time is the time between the instant of removal of an applied magnetic field to a dry-reed switch
and the instant of the first physical opening of this switch. The
release time does not include bounce time.
Bounce: Bounce is a momentary opening of a switch after
initial closing, or a momentary closing after initial opening.
Bounce Time: The bounce time is the interval of time between the instant of initial closing (or opening) and the instant of
final closing (or opening) of the dry-reed switch.
Dry-Reed Switch Contact Resistance: The dry-reed
switch contact resistance is the resistance of the dry-reed switch
under specified conditions of measurement.
INFORMATION RESOURCES
The following Applications Notes and White Papers relating to
the RR100 switch are available in the Resource Library area of
the Coto Website.
1. White Paper: “MEMS-Based Magnetic Reed
Switch Technology”
9. Contact debouncing
2. IEEE Holm Conference Paper: “A High Aspect
Since the RR100 is a mechanical switch, the contacts may
bounce after closure. Implement a hardware or software debounce solution if contact bounce is likely to cause switching
logic problems.
Ratio Microfabricated Switch Capable of Hot
Switching”
3. Tech Tips: Soldering Guidelines for the RedRock
Switch
GLOSSARY OF TERMS
Dry-Reed Switch: A dry-reed switch is an electrical switching
assembly containing one or more ferromagnetic contact blades,
hermetically sealed in a protective envelope, that are forced into
contact by an external magnetic field. The field may be generated by a current-carrying coil of wire, a permanent magnet, or a
combination of both.
4. Tech Tips: Angular Sensitivity Map of RedRock
Switch
5. Tech Tips: Optimal Z-Axis Magnet Positioning of
RedRock Switch
rev. 02122015
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COTO TECHNOLOGY | tel: (401) 943.2686 | cotorelay.com
REDROCK™ TECHNICAL & APPLICATIONS INFORMATION
COTO TECHNOLOGY PRODUCT WARRANTY
Coto Technology, Inc. (“Coto”) warrants that during the six (6) or eighteen (18) month period (“Warranty Period”) from the date
of Coto’s shipment of switches or relays and other small signal switching products (“Products”), the Products will be free from defects
in material and workmanship. This Warranty shall not apply to defects caused by disasters such as fire, flood, wind, and lightning, or
by the actions or inactions of any party other than Coto including improper storage, installation, use or maintenance of the Products.
ALL OTHER WARRANTIES, WHETHER EXPRESSED OR IMPLIED OR ARISING BY OPERATION OF LAW, COURSE
OF DEALING, USAGE OF TRADE, OR OTHERWISE, ARE EXCLUDED. THERE ARE NO IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. If during the Warranty Period Customer discovers a defect
in the material or workmanship of the Products, notifies Coto in writing within five (5) days of such discovery, and substantiates that the
Products have been installed, maintained and operated in accordance with Coto’s recommendations and standard industry practice, Coto
shall (at its option) repair or replace the defective Products or refund the purchase price of the defective Products less the value of any portion
of the Products retained by Customer. Repair or replacement of the Product shall not extend the Warranty Period in any manner. THESE
REMEDIES CONSTITUTE CUSTOMER’S EXCLUSIVE REMEDIES AGAINST COTO FOR BREACH OF WARRANTY WITH
RESPECT TO THE PRODUCTS. In no case shall Coto be liable for any special, incidental or consequential damages (including, without
limitation, labor, loss of profits, loss of savings or revenue, loss of use of the Products, cost of capital, cost of any substitute Products, facilities
or service, downtime, the claim of third parties including customers, and injury to property) whether due to delays in the production,
shipment or delivery of the Products or to causes within Coto’s control and whether based upon breach of any warranty, breach of contract,
negligence, strict tort, or any other legal theory. Any legal action for breach of warranty must be commenced within the Warranty Period. If
the Products are manufactured in accordance with design data approved by the Customer; or if they have been modified or altered without
Coto’s consent; or if the Products have been misused, misapplied, damaged or used negligently, Customer agrees to hold harmless and
indemnify Coto against any loss, cost, damage or expense, including, without limitation, cost of defense, attorney’s fees, inspectors’ fees
and/or testing, resulting from (a) third party claims for personal injuries or property damage, whether direct or indirect, actual or alleged,
consequential or otherwise, notwithstanding any actual or alleged defects or hazard inherent in the Products or negligence of Coto, its
agents, employees or subcontractors, or (b) any recall, inspection, testing, replacement or correction or the Products, whether required by
governmental authority or otherwise, or (c) the violation of any law, regulation, rule, order or restriction of any governmental authority
resulting from or incident to the sale, delivery, installation and/or assembly of the Products or (d) any actual or alleged infringement of any
United States or foreign patent, copyright or similar common or civil law right.
COTO TECHNOLOGY
Copyright 2015 Coto Technology, Inc., 66 Whitecap Drive, North Kingstown, Rhode Island 02852, USA. All rights reserved. The copyright in this document is
owned by Coto Technology, Inc., a Delaware corporation. Any person is hereby authorized to view, copy, print and distribute this document subject to the following conditions:
The document may be used for information purposes only.
The document may only be used for non-commercial purposes.
u Any copy of this document or portion thereof must include this copyright notice.
u
u
TRADEMARKS
Any product, process or technology in this document may be the subject of patents or other intellectual property rights reserved by Coto Technology, Inc. or its
affiliates and subsidiaries, and may not be licensed hereunder.
The Coto Logo and the brick red color of reed relays and magnetically operated encapsulated reed switches manufactured by Coto are Registered Trademarks of
Coto Technology Inc.
All other product names, trademarks, registered trademarks, service marks or registered service marks, mentioned throughout any part of this publication
belong to their respective owners.
DISCLAIMERS
THIS PUBLICATION IS PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON INFRINGEMENT OR ARISING FROM A COURSE OF DEALING, USAGE, TRADE, OR
PRACTICE. THIS PUBLICATION COULD CONTAIN TECHNICAL INACCURACIES OR TYPOGRAPHICAL ERRORS. CHANGES ARE PERIODICALLY ADDED TO THE INFORMATION
HEREIN; THESE CHANGES WILL BE INCORPORATED IN FUTURE REVISIONS OF THIS PUBLICATION. COTO TECHNOLOGY, INC. MAY MAKE IMPROVEMENTS AND/OR
CHANGES IN THE PRODUCT(S), TECHNICAL SPECIFICATIONS, AND PRODUCT PROMOTIONS DESCRIBED IN THIS PUBLICATION AT ANY TIME WITHOUT NOTICE. IN NO EVENT SHALL COTO TECHNOLOGY, INC. BE LIABLE FOR ANY ACTUAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES, LOST PROFITS OR LOST DATA OR ANY
INDIRECT DAMAGES EVEN IF COTO TECHNOLOGY, INC. HAS BEEN INFORMED OF THE POSSIBILITY THEREOF.
rev. 02122015
COTO TECHNOLOGY | tel: (401) 943.2686 | cotorelay.com
7
66 Whitecap Drive
North Kingstown, RI 02852
401-943-2686 • Fax: 401-942-0920
www.cotorelay.com • [email protected]
8
Copyright Coto Technology 2015. All rights reserved.
rev. 02122015